Method for transmitting and receiving signal by terminal and base station in wireless communication system and device supporting same

ABSTRACT

Disclosed are a method for transmitting and receiving a signal by a terminal and a base station and a device supporting same. More particularly, disclosed are a method for transmitting and receiving a signal by a base station or a terminal by means of applying a beam-forming method which varies for each predetermined resource region, and a device supporting same.

TECHNICAL FIELD

The following description relates to a wireless communication system,and more particularly, to a method of transmitting and receiving asignal between a user equipment (UE) and a base station (BS) in awireless communication system, and an apparatus supporting the same.

More specifically, the following description includes a description of amethod of transmitting and receiving a signal by applying a differentbeamforming scheme to each predetermined resource area, performed by aBS or a UE, and an apparatus supporting the same.

Especially, the following description includes a description of a methodof transmitting an uplink control channel or an uplink shared channel byapplying a different beamforming scheme to each time/frequency resourcearea according to a predetermined rule, performed by a UE, and anapparatus supporting the same according to the present invention.

BACKGROUND ART

Wireless access systems have been widely deployed to provide varioustypes of communication services such as voice or data. In general, awireless access system is a multiple access system that supportscommunication of multiple users by sharing available system resources (abandwidth, transmission power, etc.) among them. For example, multipleaccess systems include a Code Division Multiple Access (CDMA) system, aFrequency Division Multiple Access (FDMA) system, a Time DivisionMultiple Access (TDMA) system, an Orthogonal Frequency Division MultipleAccess (OFDMA) system, and a Single Carrier Frequency Division MultipleAccess (SC-FDMA) system.

As a number of communication devices have required higher communicationcapacity, the necessity of the mobile broadband communication muchimproved than the existing radio access technology (RAT) has increased.In addition, massive machine type communications (MTC) capable ofproviding various services at anytime and anywhere by connecting anumber of devices or things to each other has been considered in thenext generation communication system. Moreover, a communication systemdesign capable of supporting services/UEs sensitive to reliability andlatency has been discussed.

As described above, the introduction of the next generation RATconsidering the enhanced mobile broadband communication, massive MTC,ultra-reliable and low latency communication (URLLC), and the like hasbeen discussed.

DISCLOSURE Technical Problem

An aspect of the present invention is to provide a method oftransmitting and receiving a signal between a user equipment (UE) and abase station (BS) in a new proposed communication system, and anapparatus supporting the same.

Particularly, an aspect of the present invention is to provide a methodof transmitting an uplink signal in a precoder cycling scheme whichapplies a different beamforming scheme to each predetermined resourcearea by a UE, for efficient transmission of the uplink signal (e.g.,control information, data information, etc.) to a BS, and an apparatussupporting the same.

It will be appreciated by persons skilled in the art that the objectsthat could be achieved with the present disclosure are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present disclosure could achieve will be more clearlyunderstood from the following detailed description.

Technical Solution

The present invention provides methods and apparatuses for transmittingand receiving a signal by a base station (BS) and a user equipment (UE)in a wireless communication system. Particularly, the present inventionprovides methods and apparatuses for transmitting an uplink signal to aBS by using a different beamforming scheme (i.e., a different precodercycling scheme) per predetermined resource area carrying the uplinksignal.

In an aspect of the present disclosure, a method of transmitting anuplink signal by a UE in a wireless communication system includestransmitting the uplink signal by applying a different beamformingscheme to each of resource areas divided according to a predeterminedrule in one or more symbols of a slot including a plurality of symbols.

In another aspect of the present disclosure, a UE for transmitting anuplink signal to a BS in a wireless communication system includes atransmitter, a receiver, and a processor operatively connected to thetransmitter and the receiver. The processor is configured to transmitthe uplink signal by applying a different beamforming scheme to each ofresource areas divided according to a predetermined rule in one or moresymbols of a slot including a plurality of symbols.

Herein, the uplink signal may be a physical uplink control channel(PUCCH) or a physical uplink shared channel (PUSCH).

Further, in the present invention, the application of a differentbeamforming scheme to each of resource areas divided according to apredetermined rule may mean applying one or more of digital beamforming,analog beamforming, and hybrid beamforming differently to each of theresources areas divided according to the predetermined rule.

In the present invention, if the uplink signal is transmitted in onesymbol, the uplink signal may be transmitted by applying a differentbeamforming scheme to each of the frequency areas divided according tothe predetermined rule in the one symbol.

The method may further include receiving information about thepredetermined rule from the BS. The information about the predeterminedrule may include one of information about the size of frequencyresources to which the same beamforming scheme is applied, andinformation about a range of frequency resources to which the samebeamforming scheme is applied.

In the present invention, if the uplink signal is mapped distributedlyin the frequency domain within one symbol, the predetermined rule mayindicate division of resource areas in which a different beamformingscheme is applied to each set of contiguous frequency resources or eachset of contiguous resources of the same comb index in the one symbolcarrying the uplink signal.

In the present invention, if the uplink signal is transmitted in twosymbols, the predetermined rule may indicate division of resource areasin which a different beamforming scheme is applied to each symbolcarrying the uplink signal.

In the present invention, if the uplink signal is transmitted in twosymbols, the predetermined rule may indicate division of resource areasin which a different beamforming scheme is applied to each of a symbolincluding a reference signal (RS) and a symbol without an RS.

In the present invention, if the uplink signal is transmitted in twosymbols, the predetermined rule may indicate division of resource areasin which a different beamforming scheme is applied to each frequencyresource area of a predetermined size in the two symbols.

In the present invention, if the uplink signal is transmitted in morethan two symbols, the predetermined rule may indicate division ofresource areas in which a different beamforming scheme is applied toeach of a symbol including an RS and a symbol without an RS.

Further, if the uplink signal is transmitted by frequency hopping inmore than two symbols, the predetermined rule may indicate division ofresource areas in which a different beamforming scheme is applied toeach hop in the more than two symbols.

It is to be understood that both the foregoing general description andthe following detailed description of the present disclosure areexemplary and explanatory and are intended to provide furtherexplanation of the disclosure as claimed.

Advantageous Effects

As is apparent from the above description, the embodiments of thepresent invention have the following effects.

According to the present invention, a UE can efficiently transmit anuplink signal to a BS in a new proposed wireless communication system.

Particularly according to the present invention, a UE can efficientlytransmit a physical uplink control channel (PUCCH) including apredetermined number of symbols to a BS.

The effects that can be achieved through the embodiments of the presentinvention are not limited to what has been particularly describedhereinabove and other effects which are not described herein can bederived by those skilled in the art from the following detaileddescription. That is, it should be noted that the effects which are notintended by the present invention can be derived by those skilled in theart from the embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention, provide embodiments of the presentinvention together with detail explanation. Yet, a technicalcharacteristic of the present invention is not limited to a specificdrawing. Characteristics disclosed in each of the drawings are combinedwith each other to configure a new embodiment. Reference numerals ineach drawing correspond to structural elements.

FIG. 1 is a diagram illustrating physical channels and a signaltransmission method using the physical channels;

FIG. 2 is a diagram illustrating exemplary radio frame structures;

FIG. 3 is a diagram illustrating an exemplary resource grid for theduration of a downlink slot;

FIG. 4 is a diagram illustrating an exemplary structure of an uplinksubframe;

FIG. 5 is a diagram illustrating an exemplary structure of a downlinksubframe;

FIG. 6 is a diagram illustrating a self-contained subframe structureapplicable to the present invention;

FIGS. 7 and 8 are diagrams illustrating representative methods forconnecting TXRUs to antenna elements;

FIG. 9 is a simplified diagram illustrating a frame structure carryinguplink data in a new radio access technology (RAT) (NR) system to whichthe present invention is applicable;

FIG. 10 is a simplified diagram illustrating a transmission diversity(TxD) transmission method according to an example of the presentinvention;

FIG. 11 is a simplified diagram illustrating a TxD method in the case of2 antenna ports (APs)/layers used for a downlink transmission in alegacy long term evolution (LTE) system, and FIG. 12 is a simplifieddiagram illustrating a TxD method in the case of 4 APs/layers used for adownlink transmission in the legacy LTE system;

FIGS. 13 and 14 are simplified diagrams illustrating space frequencyblock coding (SFBC)-based TxD transmission methods using according to anexample of the present invention;

FIG. 15 is a simplified diagram illustrating an SFBC-based TxDtransmission method according to another example of the presentinvention;

FIG. 16 is a simplified diagram illustrating an SFBC-based TxDtransmission method according to another example of the presentinvention;

FIG. 17 is a simplified diagram illustrating a configuration fortransmitting a phase tracking reference signal (PTRS) on one subcarrierper PTRS AP according to an example of the present invention; and

FIG. 18 is a block diagram of a user equipment (UE) and a base station(BS) for implementing the proposed embodiments.

BEST MODE FOR CARRYING OUT THE INVENTION

The embodiments of the present disclosure described below arecombinations of elements and features of the present disclosure inspecific forms. The elements or features may be considered selectiveunless otherwise mentioned. Each element or feature may be practicedwithout being combined with other elements or features. Further, anembodiment of the present disclosure may be constructed by combiningparts of the elements and/or features. Operation orders described inembodiments of the present disclosure may be rearranged. Someconstructions or elements of any one embodiment may be included inanother embodiment and may be replaced with corresponding constructionsor features of another embodiment.

In the description of the attached drawings, a detailed description ofknown procedures or steps of the present disclosure will be avoided lestit should obscure the subject matter of the present disclosure. Inaddition, procedures or steps that could be understood to those skilledin the art will not be described either.

Throughout the specification, when a certain portion “includes” or“comprises” a certain component, this indicates that other componentsare not excluded and may be further included unless otherwise noted. Theterms “unit”, “-or/er” and “module” described in the specificationindicate a unit for processing at least one function or operation, whichmay be implemented by hardware, software or a combination thereof. Inaddition, the terms “a or an”, “one”, “the” etc. may include a singularrepresentation and a plural representation in the context of the presentdisclosure (more particularly, in the context of the following claims)unless indicated otherwise in the specification or unless contextclearly indicates otherwise.

In the embodiments of the present disclosure, a description is mainlymade of a data transmission and reception relationship between a BaseStation (BS) and a User Equipment (UE). A BS refers to a terminal nodeof a network, which directly communicates with a UE. A specificoperation described as being performed by the BS may be performed by anupper node of the BS.

Namely, it is apparent that, in a network comprised of a plurality ofnetwork nodes including a BS, various operations performed forcommunication with a UE may be performed by the BS, or network nodesother than the BS. The term ‘BS’ may be replaced with a fixed station, aNode B, an evolved Node B (eNode B or eNB), an Advanced Base Station(ABS), an access point, etc.

In the embodiments of the present disclosure, the term terminal may bereplaced with a UE, a Mobile Station (MS), a Subscriber Station (SS), aMobile Subscriber Station (MSS), a mobile terminal, an Advanced MobileStation (AMS), etc.

A transmission end is a fixed and/or mobile node that provides a dataservice or a voice service and a reception end is a fixed and/or mobilenode that receives a data service or a voice service. Therefore, a UEmay serve as a transmission end and a BS may serve as a reception end,on an UpLink (UL). Likewise, the UE may serve as a reception end and theBS may serve as a transmission end, on a DownLink (DL).

The embodiments of the present disclosure may be supported by standardspecifications disclosed for at least one of wireless access systemsincluding an Institute of Electrical and Electronics Engineers (IEEE)802.xx system, a 3rd Generation Partnership Project (3GPP) system, a3GPP Long Term Evolution (LTE) system, and a 3GPP2 system. Inparticular, the embodiments of the present disclosure may be supportedby the standard specifications, 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS36.213, 3GPP TS 36.321 and 3GPP TS 36.331. That is, the steps or parts,which are not described to clearly reveal the technical idea of thepresent disclosure, in the embodiments of the present disclosure may beexplained by the above standard specifications. All terms used in theembodiments of the present disclosure may be explained by the standardspecifications.

Reference will now be made in detail to the embodiments of the presentdisclosure with reference to the accompanying drawings. The detaileddescription, which will be given below with reference to theaccompanying drawings, is intended to explain exemplary embodiments ofthe present disclosure, rather than to show the only embodiments thatcan be implemented according to the disclosure.

The following detailed description includes specific terms in order toprovide a thorough understanding of the present disclosure. However, itwill be apparent to those skilled in the art that the specific terms maybe replaced with other terms without departing the technical spirit andscope of the present disclosure.

For example, the term, TxOP may be used interchangeably withtransmission period or Reserved Resource Period (RRP) in the same sense.Further, a Listen-Before-Talk (LBT) procedure may be performed for thesame purpose as a carrier sensing procedure for determining whether achannel state is idle or busy, CCA (Clear Channel Assessment), CAP(Channel Access Procedure).

Hereinafter, 3GPP LTE/LTE-A systems are explained, which are examples ofwireless access systems.

The embodiments of the present disclosure can be applied to variouswireless access systems such as Code Division Multiple Access (CDMA),Frequency Division Multiple Access (FDMA), Time Division Multiple Access(TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), SingleCarrier Frequency Division Multiple Access (SC-FDMA), etc.

CDMA may be implemented as a radio technology such as UniversalTerrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented asa radio technology such as Global System for Mobile communications(GSM)/General packet Radio Service (GPRS)/Enhanced Data Rates for GSMEvolution (EDGE). OFDMA may be implemented as a radio technology such asIEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA(E-UTRA), etc.

UTRA is a part of Universal Mobile Telecommunications System (UMTS).3GPP LTE is a part of Evolved UMTS (E-UMTS) using E-UTRA, adopting OFDMAfor DL and SC-FDMA for UL. LTE-Advanced (LTE-A) is an evolution of 3GPPLTE. While the embodiments of the present disclosure are described inthe context of a 3GPP LTE/LTE-A system in order to clarify the technicalfeatures of the present disclosure, the present disclosure is alsoapplicable to an IEEE 802.16e/m system, etc.

1. 3GPP LTE/LTE-A System

1.1 Physical Channels and Method of Transmitting and Receiving Signalson the Physical Channels

In a wireless access system, a UE receives information from an eNB on aDL and transmits information to the eNB on a UL. The informationtransmitted and received between the UE and the eNB includes generaldata information and various types of control information. There aremany physical channels according to the types/usages of informationtransmitted and received between the eNB and the UE.

FIG. 1 illustrates physical channels and a general signal transmissionmethod using the physical channels, which may be used in embodiments ofthe present disclosure.

When a UE is powered on or enters a new cell, the UE performs initialcell search (S11). The initial cell search involves acquisition ofsynchronization to an eNB. Specifically, the UE synchronizes its timingto the eNB and acquires information such as a cell Identifier (ID) byreceiving a Primary Synchronization Channel (P-SCH) and a SecondarySynchronization Channel (S-SCH) from the eNB.

Then the UE may acquire information broadcast in the cell by receiving aPhysical Broadcast Channel (PBCH) from the eNB.

During the initial cell search, the UE may monitor a DL channel state byreceiving a Downlink Reference Signal (DL RS).

After the initial cell search, the UE may acquire more detailed systeminformation by receiving a Physical Downlink Control Channel (PDCCH) andreceiving a Physical Downlink Shared Channel (PDSCH) based oninformation of the PDCCH (S12).

To complete connection to the eNB, the UE may perform a random accessprocedure with the eNB (S13 to S16). In the random access procedure, theUE may transmit a preamble on a Physical Random Access Channel (PRACH)(S13) and may receive a PDCCH and a PDSCH associated with the PDCCH(S14). In the case of contention-based random access, the UE mayadditionally perform a contention resolution procedure includingtransmission of an additional PRACH (S15) and reception of a PDCCHsignal and a PDSCH signal corresponding to the PDCCH signal (S16).

After the above procedure, the UE may receive a PDCCH and/or a PDSCHfrom the eNB (S17) and transmit a Physical Uplink Shared Channel (PUSCH)and/or a Physical Uplink Control Channel (PUCCH) to the eNB (S18), in ageneral UL/DL signal transmission procedure.

Control information that the UE transmits to the eNB is genericallycalled Uplink Control Information (UCI). The UCI includes a HybridAutomatic Repeat and reQuest Acknowledgement/Negative Acknowledgement(HARQ-ACK/NACK), a Scheduling Request (SR), a Channel Quality Indicator(CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI), etc.

In the LTE system, UCI is generally transmitted on a PUCCH periodically.However, if control information and traffic data should be transmittedsimultaneously, the control information and traffic data may betransmitted on a PUSCH. In addition, the UCI may be transmittedaperiodically on the PUSCH, upon receipt of a request/command from anetwork.

1.2. Resource Structure

FIG. 2 illustrates exemplary radio frame structures used in embodimentsof the present disclosure.

FIG. 2(a) illustrates frame structure type 1. Frame structure type 1 isapplicable to both a full Frequency Division Duplex (FDD) system and ahalf FDD system.

One radio frame is 10 ms (Tf=307200·Ts) long, including equal-sized 20slots indexed from 0 to 19. Each slot is 0.5 ms (Tslot=15360·Ts) long.One subframe includes two successive slots. An ith subframe includes2ith and (2i+1)th slots. That is, a radio frame includes 10 subframes. Atime required for transmitting one subframe is defined as a TransmissionTime Interval (TTI). Ts is a sampling time given as Ts=1/(15kHz×2048)=3.2552×10-8 (about 33 ns). One slot includes a plurality ofOrthogonal Frequency Division Multiplexing (OFDM) symbols or SC-FDMAsymbols in the time domain by a plurality of Resource Blocks (RBs) inthe frequency domain.

A slot includes a plurality of OFDM symbols in the time domain. SinceOFDMA is adopted for DL in the 3GPP LTE system, one OFDM symbolrepresents one symbol period. An OFDM symbol may be called an SC-FDMAsymbol or symbol period. An RB is a resource allocation unit including aplurality of contiguous subcarriers in one slot.

In a full FDD system, each of 10 subframes may be used simultaneouslyfor DL transmission and UL transmission during a 10-ms duration. The DLtransmission and the UL transmission are distinguished by frequency. Onthe other hand, a UE cannot perform transmission and receptionsimultaneously in a half FDD system.

The above radio frame structure is purely exemplary. Thus, the number ofsubframes in a radio frame, the number of slots in a subframe, and thenumber of OFDM symbols in a slot may be changed.

FIG. 2(b) illustrates frame structure type 2. Frame structure type 2 isapplied to a Time Division Duplex (TDD) system. One radio frame is 10 ms(Tf=307200·Ts) long, including two half-frames each having a length of 5ms (=153600·Ts) long. Each half-frame includes five subframes each being1 ms (=30720·Ts) long. An ith subframe includes 2ith and (2i+1)th slotseach having a length of 0.5 ms (Tslot=15360·Ts). Ts is a sampling timegiven as Ts=1/(15 kHz×2048)=3.2552×10-8 (about 33 ns).

A type-2 frame includes a special subframe having three fields, DownlinkPilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot(UpPTS). The DwPTS is used for initial cell search, synchronization, orchannel estimation at a UE, and the UpPTS is used for channel estimationand UL transmission synchronization with a UE at an eNB. The GP is usedto cancel UL interference between a UL and a DL, caused by themulti-path delay of a DL signal.

[Table 1] below lists special subframe configurations (DwPTS/GP/UpPTSlengths).

TABLE 1 Normal cyclic prefix in downlink Extended cyclic prefix indownlink UpPTS UpPTS Normal Extended Normal Extended Special subframecyclic prefix cyclic prefix cyclic prefix cyclic prefix configurationDwPTS in uplink in uplink DwPTS in uplink in uplink 0  6592 · T_(s) 2192· T_(s) 2560 · T_(s)  7680 · T_(s) 2192 · T_(s) 2560 · T_(s) 1 19760 ·T_(s) 20480 · T_(s) 2 21952 · T_(s) 23040 · T_(s) 3 24144 · T_(s) 25600· T_(s) 4 26336 · T_(s)  7680 · T_(s) 5  6592 · T_(s) 4384 · T_(s) 5120· T_(s) 20480 · T_(s) 4384 · T_(s) 5120 · T_(s) 6 19760 · T_(s) 23040 ·T_(s) 7 21952 · T_(s) — — — 8 24144 · T_(s) — — —

FIG. 3 illustrates an exemplary structure of a DL resource grid for theduration of one DL slot, which may be used in embodiments of the presentdisclosure.

Referring to FIG. 3, a DL slot includes a plurality of OFDM symbols inthe time domain. One DL slot includes 7 OFDM symbols in the time domainand an RB includes 12 subcarriers in the frequency domain, to which thepresent disclosure is not limited.

Each element of the resource grid is referred to as a Resource Element(RE). An RB includes 12×7 REs. The number of RBs in a DL slot, NDLdepends on a DL transmission bandwidth. The structure of the uplink slotmay be the same as the structure of the downlink slot.

FIG. 4 illustrates a structure of a UL subframe which may be used inembodiments of the present disclosure.

Referring to FIG. 4, a UL subframe may be divided into a control regionand a data region in the frequency domain. A PUCCH carrying UCI isallocated to the control region and a PUSCH carrying user data isallocated to the data region. To maintain a single carrier property, aUE does not transmit a PUCCH and a PUSCH simultaneously. A pair of RBsin a subframe are allocated to a PUCCH for a UE. The RBs of the RB pairoccupy different subcarriers in two slots. Thus it is said that the RBpair frequency-hops over a slot boundary.

FIG. 5 illustrates a structure of a DL subframe that may be used inembodiments of the present disclosure.

Referring to FIG. 5, up to three OFDM symbols of a DL subframe, startingfrom OFDM symbol 0 are used as a control region to which controlchannels are allocated and the other OFDM symbols of the DL subframe areused as a data region to which a PDSCH is allocated. DL control channelsdefined for the 3GPP LTE system include a Physical Control FormatIndicator Channel (PCFICH), a PDCCH, and a Physical Hybrid ARQ IndicatorChannel (PHICH).

The PCFICH is transmitted in the first OFDM symbol of a subframe,carrying information about the number of OFDM symbols used fortransmission of control channels (i.e. the size of the control region)in the subframe. The PHICH is a response channel to a UL transmission,delivering an HARQ ACK/NACK signal. Control information carried on thePDCCH is called Downlink Control Information (DCI). The DCI transportsUL resource assignment information, DL resource assignment information,or UL Transmission (Tx) power control commands for a UE group.

2. New Radio Access Technology System

As more and more communication devices require greater communicationcapacity, there is a need for mobile broadband communication enhancedover existing radio access technology (RAT). In addition, massiveMachine-Type Communications (MTC) capable of providing a variety ofservices anywhere and anytime by connecting multiple devices and objectsis also considered. Communication system design considering services/UEssensitive to reliability and latency is also under discussion.

Thus, introduction of a new radio access technology considering enhancedmobile broadband communication, massive MTC, and Ultra-Reliable and LowLatency Communication (URLLC) is being discussed. In the presentinvention, for simplicity, this technology will be referred to as NewRAT or NR (New Radio).

2.1. Self-Contained Subframe Structure

FIG. 6 is a diagram illustrating a self-contained subframe structureapplicable to the present invention.

In the NR system to which the present invention is applicable, aself-contained subframe structure as shown in FIG. 6 is proposed inorder to minimize data transmission latency in the TDD system.

In FIG. 6, the hatched region (e.g., symbol index=0) represents adownlink control region, and the black region (e.g., symbol index=13)represents an uplink control region. The other region (e.g., symbolindex=1 to 12) may be used for downlink data transmission or for uplinkdata transmission.

In this structure, DL transmission and UL transmission may besequentially performed in one subframe. In addition, DL data may betransmitted and received in one subframe and UL ACK/NACK therefor may betransmitted and received in the same subframe. As a result, thisstructure may reduce time taken to retransmit data when a datatransmission error occurs, thereby minimizing the latency of final datatransmission.

In such a self-contained subframe structure, a time gap having a certaintime length is required in order for the base station and the UE toswitch from the transmission mode to the reception mode or from thereception mode to the transmission mode. To this end, some OFDM symbolsat the time of switching from DL to UL in the self-contained subframestructure may be set as a guard period (GP).

While a case where the self-contained subframe structure includes boththe DL control region and the UL control region has been describedabove, the control regions may be selectively included in theself-contained subframe structure. In other words, the self-containedsubframe structure according to the present invention may include notonly the case of including both the DL control region and the UL controlregion but also the case of including either the DL control region orthe UL control region alone as shown in FIG. 6.

For simplicity of explanation, the frame structure configured as aboveis referred to as a subframe, but this configuration can also bereferred to as a frame or a slot. For example, in the NR system, oneunit consisting of a plurality of symbols may be referred to as a slot.In the following description, a subframe or a frame may be replaced withthe slot described above.

2.2. OFDM Numerology

The NR system uses the OFDM transmission scheme or a similartransmission scheme. Here, the NR system may typically have the OFDMnumerology as shown in Table 2.

TABLE 2 Parameter Value Subcarrier-spacing (Δf) 75 kHz OFDM symbollength 13.33 μs Cyclic Prefix(CP) length 1.04 us/0.94 μs System BW 100MHz No. of available subcarriers 1200 Subframe length 0.2 ms Number ofOFDM symbol per Subframe 14 symbols

Alternatively, the NR system may use the OFDM transmission scheme or asimilar transmission scheme, and may use an OFDM numerology selectedfrom among multiple OFDM numerologies as shown in Table 3. Specifically,as disclosed in Table 3, the NR system may take the 15 kHzsubcarrier-spacing used in the LTE system as a base, and use an OFDMnumerology having subcarrier-spacing of 30, 60, and 120 kHz, which aremultiples of the 15 kHz subcarrier-spacing.

In this case, the cyclic prefix, the system bandwidth (BW) and thenumber of available subcarriers disclosed in Table 3 are merely anexample that is applicable to the NR system according to the presentinvention, and the values thereof may vary depending on theimplementation method. Typically, for the 60 kHz subcarrier-spacing, thesystem bandwidth may be set to 100 MHz. In this case, the number ofavailable subcarriers may be greater than 1500 and less than 1666. Also,the subframe length and the number of OFDM symbols per subframedisclosed in Table 3 are merely an example that is applicable to the NRsystem according to the present invention, and the values thereof mayvary depending on the implementation method.

TABLE 3 Parameter Value Value Value Value Subcarrier-spacing 15 kHz 30kHz 60 kHz 120 kHz (Δf) OFDM symbol length 66.66 33.33 16.66 8.33 CyclicPrefix(CP) length 5.20 μs/4.69 μs 2.60 μs/2.34 μs 1.30 μs/1.17 μs 0.65μs/0.59 μs System BW 20 MHz 40 MHz 80 MHz 160 MHz No. of available1200    1200    1200    1200     subcarriers Subframe length 1 ms 0.5 ms0.25 ms 0.125 ms Number of OFDM 14 symbols 14 symbols 14 symbols 14symbols symbol per Subframe

2.3. Analog Beamforming

In a millimeter wave (mmW) system, since a wavelength is short, aplurality of antenna elements can be installed in the same area. Thatis, considering that the wavelength at 30 GHz band is 1 cm, a total of100 antenna elements can be installed in a 5*5 cm panel at intervals of0.5 lambda (wavelength) in the case of a 2-dimensional array. Therefore,in the mmW system, it is possible to improve the coverage or throughputby increasing the beamforming (BF) gain using multiple antenna elements.

In this case, each antenna element can include a transceiver unit (TXRU)to enable adjustment of transmit power and phase per antenna element. Bydoing so, each antenna element can perform independent beamforming perfrequency resource.

However, installing TXRUs in all of the about 100 antenna elements isless feasible in terms of cost. Therefore, a method of mapping aplurality of antenna elements to one TXRU and adjusting the direction ofa beam using an analog phase shifter has been considered. However, thismethod is disadvantageous in that frequency selective beamforming isimpossible because only one beam direction is generated over the fullband.

To solve this problem, as an intermediate form of digital BF and analogBF, hybrid BF with B TXRUs that are fewer than Q antenna elements can beconsidered. In the case of the hybrid BF, the number of beam directionsthat can be transmitted at the same time is limited to B or less, whichdepends on how B TXRUs and Q antenna elements are connected.

FIGS. 7 and 8 are diagrams illustrating representative methods forconnecting TXRUs to antenna elements. Here, the TXRU virtualizationmodel represents the relationship between TXRU output signals andantenna element output signals.

FIG. 7 shows a method for connecting TXRUs to sub-arrays. In FIG. 7, oneantenna element is connected to one TXRU.

Meanwhile, FIG. 8 shows a method for connecting all TXRUs to all antennaelements. In FIG. 8, all antenna element are connected to all TXRUs. Inthis case, separate addition units are required to connect all antennaelements to all TXRUs as shown in FIG. 8.

In FIGS. 7 and 8, W indicates a phase vector weighted by an analog phaseshifter. That is, W is a major parameter determining the direction ofthe analog beamforming. In this case, the mapping relationship betweenCSI-RS antenna ports and TXRUs may be 1:1 or 1-to-many

The configuration shown in FIG. 7 has a disadvantage in that it isdifficult to achieve beamforming focusing but has an advantage in thatall antennas can be configured at low cost.

On the contrary, the configuration shown in FIG. 8 is advantageous inthat beamforming focusing can be easily achieved. However, since allantenna elements are connected to the TXRU, it has a disadvantage ofhigh cost.

3. Proposed Embodiments

FIG. 9 is a simplified diagram illustrating a frame structure carryingUL data in a new RAT (NR) system to which the present invention isapplicable. A transmission time interval (TTI) may be defined as aminimum time interval during which the medium access control (MAC) layertransmits MAC protocol data units (PDUs) to the physical (PHY) layer.While it is assumed that one TTI includes 14 symbols in FIG. 9, the TTImay be configured to have a longer or shorter time length.

In FIG. 9, a NewRAT physical downlink control channel (NR-PDCCH) refersto a DL control channel carrying DL/UL scheduling information, a NewRATphysical uplink shared channel (NR-PUSCH) refers to a UL channelcarrying UL data, and a NewRAT physical uplink control channel(NR-PUCCH) refers to a UL control channel carrying information such ashybrid automatic repeat request-acknowledgement (HARQ-ACK/channel stateinformation (CSI). In addition, a demodulation reference signal (DM-RS)refers to a signal used for channel estimation performed to demodulatethe NR-PUSCH.

As illustrated in FIG. 9, each signal/channel may be transmitted in aspecific symbol(s), and on a different subcarrier per antenna port (AP).Herein, each signal/channel may be transmitted through up to 4 APs.

A phase noise compensation reference signal (PCRS)/phase trackingreference signal (PTRS) (hereinafter, referred to collectively as aPTRS) refers to a signal transmitted in addition to the DM-RS in orderto help with channel estimation in consideration of high mobility or thephase noise of an oscillator. As illustrated in FIG. 9, the PTRS may beconfigured to be transmitted on a specific subcarrier(s), and in adifferent symbol/on a different subcarrier per AP. While configurationsapplicable to the present invention are proposed on the basis of thebasic frame structure illustrated in FIG. 9 for the convenience ofdescription, those skilled in the art will clearly understand that theconfigurations are also applicable to frame structures which differ fromthe frame structure of FIG. 9 in terms of the transmission resourceareas and positions of an NR-PDCCH, a guard period, an NR-PUSCH, anNR-PUCCH, a PTRS, and a DM-RS.

Hereinbelow, methods of transmitting an NR-PUSCH in transmit diversity,methods of transmitting an NR-PUCCH in transmit diversity, methods ofmultiplexing a DM-RS/PCRS with an NR-PUSCH, and so on will be proposedon the basis of the above-described frame structure.

3.1. NR-PUSCH Transmit Diversity (TxD)

As a DL transmission method using a plurality of APs, the legacy LTE(-A)system supports both of a TxD-based method and a spatial multiplexing(SM)-based method. However, the legacy LTE(-A) system supports only anSM-based method for UL transmission.

In consideration of a larger number of APs of a UE than that of a legacyLTE UE, supported by an NR system to which the present invention isapplicable, transmission of UL data for which it is important toguarantee reliability, or coverage expansion of cell-edge UEs, the NRsystem may also support a TxD transmission method for UL transmission.

Accordingly, a detailed description will be given of a method ofindicating TxD transmission of an NR-PUSCH to a UE, and a method oftransmitting an NR-PUSCH in TxD in this section.

The following description is given of a related configuration, focusingon the NR-PUSCH, with the appreciation that the TxD indicating methodand the TxD transmission method are also applicable in the same mannerto other channels. For example, TxD for the NR-PDSCH/NR-PUSCH may beindicated by a DL grant in methods proposed in section 3.1.1 below. Inanother example, the TxD transmission method is also applicable in thesame manner to the NR-PDCCH/NR-PDSCH/NR-PUCCH.

3.1.1. TxD Indication Methods

(1) Method of indicating TxD by DCI (or physical-layer signaling)

Preferably, it may be indicated dynamically whether to transmit UL datain a TxD transmission method or an SM transmission method according tothe channel state of a UE or the service type of the UL data.

For example, information indicating TxD may be jointly encoded withscheduling information indicating a precoding matrix used for SM.Specifically, a new generation Node B (gNB) may indicate TxD by somestate of a field in DCI indicating a precoding matrix (or a codebookindex) and the number of layers. Additionally, the gNB may indicate howmany APs/layers or which APs are used for TxD by an additional field oranother state of the above-described field.

For the convenience of description, a BS operating in the NR systemaccording to the present invention is referred to as a gNB,distinguishably from an eNB which is an exemplary LTE BS. However, theterm gNB may be replaced with eNB depending on an implementationexample.

In another example, the gNB may differentiate DCI formats for TxDtransmission and SM transmission, and accordingly indicate TxD or SM toa UE by a DCI format indicator.

(2) Method of indicating TxD by higher-layer signaling (e.g. RRCsignaling)

If the channel state of a UE does not fluctuate or the quality ofservice (QoS) level of UL data that the UE transmits is similar during apredetermined time, the gNB may semi-statically indicate TxD or SM byRRC signaling.

3.1.2. TxD Transmission Method (Other Than SFBC (Space Frequency BlockCode))

The legacy LTE system adopts SFBC as a TxD transmission method for DLtransmission. This method is designed so as to achieve an optimumdiversity gain for 2Tx1Rx (i.e., 2 Txs and 1 Rx). For more than 2 APs ata transmission node, it is difficult to maximize the diversity gain withthe method. Especially, considering that the number of APs at an NR UEsupported by the NR system to which the present invention is applicablemay be larger than 2, the present invention proposes a TxD transmissionmethod to increase the diversity gain of UL transmission.

First, the basic idea of the present invention is to achieve aspatial-domain multiplexing gain by multiplying a signal by a(quasi-)orthogonal sequence per AP, prior to transmission. An orthogonalsequence of length k (k is the number of transmission APs) is multipliedacross (non-)contiguous k resources along the frequency axis (or thetime axis), and the same modulated symbol is repeatedly transmitted inthe k resources.

FIG. 10 is a simplified diagram illustrating a TxD transmission methodaccording to an example of the present invention.

As illustrated in FIG. 10, for example, a TxD method with 4 APs may beused as a UL signal transmission method. Since a UL signal istransmitted through the 4 APs, the same modulated symbol (e.g., “a” inFIG. 10) is repeatedly mapped to 4 subcarriers, and a length-4orthogonal sequence (e.g., Hadamard sequence) is multiplied by thesymbols on the subcarriers, for each AP (or layer). To guarantee thesingle carrier-frequency division multiplexing (SC-FDM) property, thisprocess needs to be performed before discrete Fourier transform (DFT).If OFDM is adopted for UL transmission, the process may be performedbefore or after inverse fast Fourier transform (IFFT). While examples ofusing 4 subcarriers are presented for the illustrative purpose in theabove description, the configuration of the present invention may beextended to a case in which UL data is transmitted on more subcarriers.In this case, subcarriers may be grouped into groups each including 4subcarriers, and an operation of the present invention may be performedin units of 4 subcarriers.

In FIG. 10, when an NR-PUSCH is transmitted in a 4-AP TxD method, 4subcarriers may form one transmission group. If a PTRS is transmitted ona specific subcarrier(s), it may be difficult to group subcarriers byfours.

Regarding N (N<4) subcarriers excluded from grouping, a symbol may betransmitted repeatedly on the N subcarriers in the same manner as N APstransmit signals in TxD, and a length-N orthogonal sequence may bemultiplied by the symbols. For example, if the PTRS is transmitted inthe manner illustrated in FIG. 9, subcarriers #0, #1, #2 and #3, andsubcarriers #8, #9, #10 and #11 are grouped respectively, withsubcarriers #5 and #6 paired. Then, a signal may be transmitted onsubcarriers #5 and #6 in TxD only through two APs, AP #1 and AP #2.

The above description may further be extended such that when a length-korthogonal sequence (k is the number of transmission APs) is multipliedacross (non-) contiguous k resources on the frequency axis (or the timeaxis), the same modulated symbol may be repeatedly transmitted in the kresources, or k or fewer modulated symbols may be transmitted in the kresources. For example, in the example of FIG. 10, a modulated symbol“a” may be repeatedly transmitted in layers #1 and #2, whereas amodulation symbol “b” may be repeatedly transmitted in layers #3 and #4.

Unlike the above method, when a length-k orthogonal sequence ismultiplied across (non-)contiguous k resources on the frequency axis (orthe time axis), k may be larger than the number of transmission APs. Inthis case, the same modulated symbol may be repeatedly transmitted ordifferent modulated symbols may be transmitted in code divisionmultiplexing (CDM), in a specific layer.

Characteristically, the afore-proposed various TxD methods and TxDmethods proposed in section 3.1.3 below may be configured differentlyaccording to modulation orders, modulation and coding schemes (MCSs),use cases/services, or the like. For example, in this section, as themodulation order increases, a peak-to-average power ratio (PAPR) alsoincreases. Thus, a TxD method simply using a codebook of an identitymatrix may be applied for an MCS equal to or larger than a predeterminedvalue. In another example, as the modulation order increases, a TxDmethod with a smaller repetition number may be applied in this section.

3.1.3. TxD Transmission Methods Using SFBC

In the legacy LTE system, a TxD method for DL transmission isimplemented in SFBC. Particularly, SFBC-based Tx transmission methodsare defined for 2 APs/layers, and 4 APs/layers in the LTE system.

FIG. 11 is a simplified diagram illustrating a TxD method in the case of2 APs/layers for DL transmission in the legacy LTE system, and FIG. 12is a simplified diagram illustrating a TxD method in the case of 4APs/layers for DL transmission in the legacy LTE system.

As illustrated in FIG. 11, in the case of 2 APs/layers, for 4 modulatedsymbols {C1, C2, C3, C4} mapped to 4 respective subcarriers, every twoadjacent ones of the 4 subcarriers are paired and SFBC is applied toeach of the pairs. As illustrated in FIG. 12, in the case of 4APs/layers, SFBC is applied to a {C1, C2} pair through APs #1 and #3,and SFBC is applied to a {C3, C4} pair through APs #2 and #4.

3.1.3.1. Method 1

If the method illustrated in FIG. 11 is applied to UL transmission, thePAPR performance of layer 1 may be same in consideration of SC-FDM.However, for layer 2, the single carrier property is not maintained,thereby degrading PAPR performance. In this section, a method ofovercoming the problem is proposed.

The basic idea proposed in this section is that when subcarriers arepaired, non-contiguous subcarriers are paired, instead of contiguoussubcarriers.

FIGS. 13 and 14 are simplified diagrams illustrating SFBC-based TxDtransmission methods according to an example of the present invention.

FIG. 13 illustrates an SFBC scheme applied to the above first example.According to the first example, as illustrated in FIG. 13, when twopaired symbols are mapped in each of layers, the pair is mapped with oneof the symbols “conjugated” in one of the layers, while the two symbolsare swapped in position, with the other symbol “conjugated” in the otherlayer.

As such, SFBC is applied as illustrated in FIG. 13 in the SFBC-based TxDtransmission method according to the first example of the presentinvention. Further, as illustrated in FIG. 14, with {C1, C3} and {C2,C4} paired respectively, SFBC may be applied on a pair basis. In thismanner, every two of symbols, which are apart from each other by asubcarrier spacing of M subcarriers, may be paired and subjected toSFBC. M may be set by physical-layer signaling or higher-layersignaling. The above method is also applicable in the same manner to acase of more than 2 APs/layers.

3.1.3.2. Method 2

Meanwhile, the mapping relationship between a coded bit stream andAPs/layers is fixed for DL, so it is not to be changed on thetime/frequency axis in the legacy LTE system. This configuration mayadvantageously increase a diversity gain by permuting the mappingrelationship on the time/frequency axis.

FIG. 15 is a simplified diagram illustrating an SFBC-based TxDtransmission method according to another example of the presentinvention.

As illustrated in FIG. 15, SFBC may be applied to a {C1, C2} pairthrough APs #1 and #2, while SFBC may be applied to a {C3, C4} pairthrough APs #3 and #4.

Additionally, both of the SFBC method illustrated in FIG. 15 and theSFBC method illustrated in FIG. 12 may be applied in the presentinvention. Each of the SFBC methods may be performed in a predeterminedrule or a rule indicated by physical-layer signaling or higher-layersignaling.

For example, the SFBC method illustrated in FIG. 15 may be applied toeven-numbered symbols, while the SFBC method illustrated in FIG. 12 maybe applied to odd-numbered symbols.

In another example, the SFBC method illustrated in FIG. 15 and the SFBCmethod illustrated in FIG. 12 may be applied alternately every foursubcarriers in an allocated frequency resource area within the samesymbol. Additionally, aside from the afore-described two SFBC methods,various combinations of mapping methods are available for mapping the{C1, C2} pair and the {C3, C4} pair to APs.

3.1.3.3. Method 3

The proposed TxD transmission methods have been described in section3.1.3.1. and section 3.1.3.2. with the appreciation that SFBC is appliedonly on the frequency axis. However, the TxD transmission methodsapplicable to the present invention may be extended to TxD transmissionmethods in which SFC is applied on the time and frequency axes incombination.

FIG. 16 is a simplified diagram illustrating an SFBC-based TxDtransmission method according to another example of the presentinvention.

For example, as illustrated in FIG. 16, while only APs #1 and #3 areselected and SFBC is applied to a pair of {C1, C2} in symbol #3, whileonly APs #2 and #4 are selected and SFBC is applied to a pair of {C3,C4} in symbol #4.

Additionally, Method 3 is advantageous in that a resource area used forPTRS transmission may be reduced.

FIG. 17 is a simplified diagram illustrating a configuration fortransmitting a PTRS on one subcarrier per PTRS AP according to anexample of the present invention.

As illustrated in FIG. 17, if a PTRS is transmitted on one (or more)subcarriers per PTRS AP, there is no need for transmitting PTRSs of allPTRS APs in one symbol in the case of TxD using only APs #1 and #3 orAPs #2 and #4 in one symbol as illustrated in FIG. 16. In other words, aPTRS may be transmitted in symbol #3 only through APs #1 and #3, while aPTRS may be transmitted in symbol #4 only through APs #2 and #4.

Characteristically, a specific transmission method (e.g., PTRS APmapping, the number of transmission subcarriers, etc.) may be changeddepending on whether a PTRS is transmitted in SM or TxD. For example,when a gNB transmits the PTRS in SM (or through a single AP), the gNBmay transmit the PTRS in the manner illustrated in FIG. 17, and when thegNB transmits the PTRS in TxD, the gNB may transmit the PTRS in themanner illustrated in FIG. 9.

Further, if the PTRS is transmitted in the TxD method proposed in thissection, PTRS APs that transmit the PTRS in each symbol may bedetermined according to APs that actually attempt data transmission inthe symbol. For example, if SFBC is applied to APs #1 and #3 for datatransmission, the PTRS may also be transmitted through APs #1 and #3.

On the contrary, if PTRS-AP mapping is preset for a specific resourcearea as illustrated in FIG. 9, SFBC may be applied to each symbol byusing two predetermined APs. In a more specific example, if the PTRS isconfigured to be transmitted in a specific symbol through APs #1 and #3,SFBC may also be applied to data transmitted in the symbol by using onlyAPs #1 and #3.

In the TxD method proposed in this section, it may be configured thateach modulated symbol is transmitted through all APs.

For example, it may be configured that the {C3, C4} pair is replacedwith the {C1, C2} pair, and thus the {C1, C2} pair is transmittedthrough all APs in FIG. 12.

In another example, it may be configured that the {C3, C4} pair isreplaced with the {C1, C2} pair, and thus the {C1, C2} pair istransmitted through all APs in FIG. 16.

In another example, it may be configured that the {C3, C4} pair isreplaced with the {C1, C2} pair, and the {C1, C2} pair is transmittedthrough all APs in FIG. 16.

3.2. NR-PUCCH Transmit Diversity (TxD)

In the NR system to which the present invention is applicable, a newPUCCH may be defined to carry UCI including an HARQ-ACK and/or CSIand/or beam-related information and/or scheduling request (SR)-relatedinformation. For the convenience of description, the new proposed PUCCHwill be referred to as an NR-PUCCH.

The NR-PUCCH may include a relatively short PUCCH including one or twosymbols (referred to as a 1-symbol PUCCH or a 2-symbol PUCCH), or arelatively long PUCCH including 4 or more symbols (referred to as a longPUCCH) in a slot with 14 (or 7) symbols.

In this section, a precoder cycling-based TxD method for each of theNR-PUCCHs will be described in detail. Precoder cycling may mean that adifferent one of digital beamforming, analog beamforming, and hybridbeamforming is performed on a predetermined time or frequency areabasis. Further, the precoder cycling may include antenna switchingand/or panel switching.

While a configuration of the present invention will be described below,focusing on the NR-PUCCH, the TxD transmission method proposed by thepresent invention may also be applied in the same manner to otherchannels (e.g., NR-PDCCH, NR-PDSCH, and NR-PUSCH).

3.2.1. 1-Symbol PUCCH TxD Method

To transmit a 1-symbol PUCCH in TxD, it may be configured that the sameprecoding/beamforming is applied on a specific frequency unit (e.g., REgroup or RB group) basis.

For example, different precoding/beamforming may be applied to a1-symbol PUCCH having 10 RBs every 5 RBs (preset or configured by L1signaling or higher-layer signaling).

In another example, when the 1-symbol PUCCH is subjected to distributedmapping, but localized mapping, the same precoding/beamforming may beconfigured for (or applied to) the 1-symbol PUCCH, only withincontiguous frequency resources (or contiguous resources of the same combindex).

In another example, precoding/beamforming applied to a specificfrequency unit may be determined by an actually mapped frequency-domainresource index irrespective of the amount of allocated frequencyresources. In a specific example, if a 100-RB band is divided intofrequency bands each having 10 RBs, the same precoding/beamforming maybe applied only to frequency resources within the same frequency band inthe allocated 1-symbol PUCCH.

In another example, if both of an RS and UCI are included in the singlesymbol, the same precoding/beamforming may be configured for (or appliedto) a frequency area in which the RS includes a predetermined number ofor more REs (preset or configured by L1 signaling or higher-layersignaling).

Meanwhile, if an RS and/or UCI are sequences, a sequence as long as thenumber of corresponding REs may be generated in a frequency area towhich the same precoding/beamforming is applied.

The method described above in this section may be applied commonly to aPUCCH structure with an RS and UCI multiplexed in frequency divisionmultiplexing (FDM), and a PUCCH structure transmitted without an RS bysequence selection.

3.2.2. 2-Symbol PUCCH TxD Method

For example, if the 2-symbol PUCCH structure is an extension of theafore-described 1-symbol PUCCH structure, a 2-symbol PUCCH may betransmitted by applying the foregoing 1-symbol PUCCH TxD method to eachsymbol.

In another example, the same or different precoding/beamforming may beapplied to two symbols. Particularly, a configuration of applying thesame precoding/beamforming to two symbols may be applied to a case inwhich the first and second symbols have the same frequency resource areaor a case in which one of the two symbols does not carry an RS, and theother symbol includes an RS.

Herein, whether to apply time-axis or frequency-axisprecoding/beamforming is configurable. For example, with the sameprecoding/beamforming on the time axis, the foregoing 1-symbol PUCCH TxDmethod may be applied to each symbol, with the sameprecoding/beamforming on the frequency axis, differentprecoding/beamforming may be applied to each symbol, or with differentprecoding/beamforming on the time axis, the foregoing 1-symbol PUCCH TxDmethod may be applied to each symbol.

The method described above in this section may be applied commonly tothe PUCCH structure with an RS and UCI multiplexed in FDM, and the PUCCHstructure transmitted without an RS by sequence selection.

3.2.3. Long PUCCH TxD Method

According to the present invention, no symbol may include an RS in along PUCCH in consideration of RS overhead. Accordingly,precoding/beamforming may be applied in a different manner inconsideration of a symbol with an RS. Herein, as an RS and UCI aremultiplexed in time division multiplexing (TDM), there may be a symbolwith the RS only and a symbol with the UCI only.

For example, when frequency hopping is performed to achieve a frequencydiversity gain, different precoding/beamforming may be applied per hop.

In another example, different precoding/beamforming may be applied toeach group of symbols carrying an RS. In a specific example, in thepresence of a plurality of RS symbols in one hop, differentprecoding/beamforming may be applied even within the one hop. If symbolsare allocated in the order of UCI, RS, RS, and UCI in one hop includingfour symbols, different precoding/beamforming may be applied between thefirst two symbols and between the last two symbols. In this case, asdifferent precoders are used, an OCC may not be applied between symbolsover which a precoder is changed within the same hop.

In another example, different precoding/beamforming may be applied to amulti-slot long PUCCH on a slot or slot group basis (preset orconfigured by L1 signaling or higher-layer signaling).

As an exemplary method of including UCI in each frequency/time resourceto which a different precoder is applied, the same coded bit may berepeatedly included or coded bits are distributedly included in theforegoing 1-symbol PUCCH TxD method, 2-symbol PUCCH TxD method, and longPUCCH TxD method.

Meanwhile, only when a predetermined number of or more ports areconfigured for PUCCH transmission (e.g., 4 ports are configured forPUCCH transmission), the foregoing precoder cycling-based 1-symbol PUCCHTxD method, 2-symbol PUCCH TxD method, and long PUCCH TxD method may beapplied.

For example, a TxD method such as 2-port space frequency block code(SFBC)/space time block code (STBC) may be applied to a PUCCH, and adifferent precoder may be applied to each predefined frequency/timeresource set by using a different AP pair. In a more specific example,when APs #1 and #2, and APs #3 and #4 are paired respectively, a UE mayapply SFBC to APs #1 and #2, and also to APs #3 and #4. When the UEtransmits a 2-symbol PUCCH, the UE may transmit the PUCCH in the firstsymbol through APs #1 and #2, and in the second symbol through APs #3and #4, thereby separating the AP pairs from each other in the timedomain.

3.3. UL RS and NR-PUSCH Transmission Method

In FIG. 9, APs used actually for NR-PUSCH transmission and the positionsof subcarriers carrying DM-RSs may be predetermined or preset.

For example, regarding APs of each UE, the same AP numbers may beassigned for an RS such as SRS/DM-RS(/PTRS) (e.g., for 4 APs, portnumbers are assigned 1, 2, 3 and 4). In this case, it may be configuredthat the SRS is transmitted through as many APs as the number of APsreported by the UE. If the UE reports 4 APs, an SRS transmission may beconfigured for APs #1, #2, #3, and #4.

Further, a resource to carry an RS sequence corresponding to an APnumber may be preset. In FIG. 9, a DM-RS and a PCRS may be transmittedrespectively in D1 and P1 through AP #1. Likewise, the DM-RS and thePTRS may be transmitted respectively in D2 and P2 through AP #2, in D3and P3 through AP #3, and in D4 and P4 through AP #4.

Herein, if only an AP used actually for NR-PUSCH transmission isindicated to the UE during UL scheduling, the UE may attempt to transmitthe DM-RS/PUSCH(/PTRS) by selecting only the AP. Herein, a correspondingDM-RS(/PTRS) transmission resource may be configured to be a resourcecorresponding to an AP number scheduled in a predetermined rule.

In other words, although only one of information about an AP usedactually for NR-PUSCH transmission and information about the position ofa subcarrier carrying a DM-RS(/PTRS) is provided to the UE, the UE mayacquire the two pieces of information. Therefore, a gain may be achievedin terms of signaling overhead during UL scheduling.

For example, if an AP used actually for NR-PUSCH transmission isindicated as #1 by DCI, the UE may transmit a DM-RS on subcarriers #0,#4 and #8 through AP #1 as pre-agreed, without additional signaling.

However, if both of UE1 and UE2 are scheduled to transmit NR-PUSCHsthrough AP #1 in MU-MIMO UL transmission, the two UEs transmit DM-RSs onthe same subcarrier, thereby degrading channel estimation performance.To avoid the problem, scheduling restriction may result.

As a solution to the above problem, the present invention proposes amethod of transmitting a DM-RS/NR-PUSCH and a method of indicating atransmission position for the DM-RS/NR-PUSCH. While a configuration ofthe present invention is described below, focusing on the DM-RS, for theconvenience, the configuration may also be applied to the PTRS.

3.3.1. An AP Used for NR-PUSCH Transmission and the Position of aResource Carrying a DM-RS are Indicated Separately by DCI (orPhysical-Layer Signaling).

(1) An AP used for NR-PUSCH transmission and the position of a resourcecarrying the DM-RS are indicated in respective bitmaps.

If there are four APs, and a DM-RS is transmitted on a differentsubcarrier through each AP as illustrated in FIG. 9, an AP indicationand the position of a resource carrying the DM-RS may be signaled in atotal of 8 bits, 4 bits for each. For example, if APs used in theNR-PUSCH transmission are indicated as “1100” and the positions ofresources carrying the DM-RS are indicated as “0011”, the UE transmitsan NR-PUSCH through APs #1 and #2, and transmits the DM-RS onsubcarriers #2, #6, and #10 through AP #1 and on subcarriers #3, #7 and#11 through AP #2.

(2) Only the positions of resources carrying a DM-RS are indicated by abitmap, and the offset of a starting AP number is indicated.

For example, the positions of resources carrying the DM-RS may besignaled as “1010” and the offset may be signaled as “1”. An offsetvalue of “0” may indicate APs #1 and #2, an offset value of “1” mayindicate APs #2 and #3, and an offset value of “2” may indicate APs #3and #4. In the above example, therefore, the UE may transmit the DM-RSthrough APs #2 and #3, specifically on subcarriers #0, #4 and #8 throughAP #2, and on subcarriers #2, #6 and #10 through AP #3.

(3) A set of APs used for NR-PUSCH transmission and/or a set of thepositions of resources carrying a DM-RS are limited to predeterminedcandidates.

Signaling two pieces of information in bitmaps as in the foregoing (1)may lead to large signaling overhead. In this context, a method ofreducing signaling overhead by limiting candidate sets which may beindicated by each bitmap may be considered.

For example, sets of APs available for NR-PUSCH transmission may belimited to {1}, {2}, {3}, {4}, {1,2}, {3,4}, and {1,2,3,4}, and sets ofthe positions of resources carrying the DM-RS may be limited to {D1},{D2}, {D3}, {D4}, {D1,D2}, {D3,D4}, and {D1,D2,D3,D4}. In this case, 3bits is required to represent each piece of information, and thus thetwo pieces of information may be signaled in a total of 6 bits.Furthermore, the two pieces of information may be jointly encoded,thereby reducing signaling overhead. More specifically, the number ofAPs linked to an AP set may be regarded as equal to that of thepositions of resources carrying the DM-RS. In this case, the informationmay be represented as a total of 21 (=4²+2²+1) states, and thus signaledby a 5-bit field in DCI.

(4) Antenna selection information such as information about APs used forNR-PUSCH transmission (or information about the positions of resourcescarrying a DM-RS) is transmitted by using a codebook (or a precodingmatrix).

For example, when the gNB indicates TxD transmission through two APsselected from among APs #1, #2, #3, and #4, if a codebook of

$\frac{1}{\sqrt{2}}\begin{bmatrix}1 \\0 \\1 \\0\end{bmatrix}$

is signaled, the UE may attempt to transmit an NR-PUSCH in TxD throughAPs #1 and #3.

3.3.2. A Different Mapping Relationship Between APs Used for NR-PUSCHTransmission and the Positions of Resources Carrying a DM-RS isConfigured for Each UE by Higher-Layer Signaling (e.g., RRC Signaling).

For example, in the case where UE1 is configured to transmit a DM-RS inresources D1, D2, D3, and D4 (in FIG. 9) through APs #1, #2, #3, and #4,and UE2 is configured to transmit a DM-RS in resources D4, D3, D2, andD1 through APs #1, #2, #3, and #4, even though the gNB indicates MU-MIMOUL transmission through AP #1 to each UE, the DM-RS of each UE may betransmitted in a different frequency resource.

The configurations described in section 3.3.1. and section 3.3.2. mayalso be applied in the same rule to the PTRS (without additionalsignaling). Or, an AP used for NR-PUSCH transmission, the position of aresource carrying a DM-RS, and the position of a resource carrying aPTRS may be indicated separately by additional signaling other than theDM-RS.

In the configurations described in section 3.3.1. and section 3.3.2., ifthe number of APs reported by the UE or the number of APs actuallyindicated for transmission is N, it may be allowed to indicateDM-RS/PTRS transmission through more than N APs. For example, when N=2,DM-RS transmission through 4 APs may be indicated. In this case, the UEmay transmit the DM-RS on all subcarriers in symbol #2 (according to apreset rule).

3.3.3. Method of Using Resources Carrying No DM-RS for NR-PUSCHTransmission

Meanwhile, if a DM-RS is transmitted in a different resource througheach AP as illustrated in FIG. 9, some resources may not be used foreither DM-RS transmission or NR-PUSCH transmission according to APs usedby the UE. For example, if one UE transmits an NR-PUSCH only through oneAP, three subcarriers out of four subcarriers of symbol #2 intransmission resource areas of the UE may not be used for transmitting aspecific signal. In this context, a specific method of allowing use ofcorresponding resources for an NR-PUSCH in order to efficiently useradio resources will be described in this section.

(1) Information about subcarriers carrying no DM-RS is indicated by DCI(or physical-layer signaling).

If a DM-RS is transmitted on a different subcarrier through each AP asillustrated in FIG. 9, the gNB may signal information about subcarriersthat do not carry the DM-RS to a UE by a 4-bit bitmap. For example, if“0011” is signaled to the UE, the UE may transmit the NR-PUSCH onsubcarriers #2, #3, #6, #7, #10, and #11 in symbol #2.

(2) Resources that do not carry a DM-RS are used in a different manneraccording to a transmission scheme of a UE.

If it is assumed that a TxD is not supposed to operate in MU-MIMO, itmay be determined implicitly whether the NR-PUSCH is mapped to asubcarrier that does not carry the DM-RS (simply without additionalsignaling). For example, it may be configured that a UE scheduled withTxD transmits an NR-PUSCH by mapping the NR-PUSCH to a subcarrier unusedfor DM-RS transmission, and a UE scheduled with a transmission schemeother than TxD does not map/transmit the NR-PUSCH to/on a subcarrierunused for DM-RS transmission. Herein, it may be indicated implicitlywhether the DM-RS is to be transmitted by existing signaling.

(3) Method of indicating to a UE only whether scheduling for the UE is“single UE scheduling” or whether “the NR-PUSCH is mapped/transmittedto/on a subcarrier unused for DM-RS transmission” irrespective of anNR-PUSCH transmission scheme (e.g., single AP transmission, TxD, or SM).

In this case, if “single UE scheduling” or “mapping/transmitting theNR-PUSCH to/on subcarrier unused for DM-RS transmission” is indicated tothe UE, the UE may map/transmit the NR-PUSCH to/on a subcarrier unusedfor DM-RS transmission. On the contrary, if “non-single UE scheduling”or “non-mapping/non-transmission of the NR-PUSCH to/on subcarrier unusedfor DM-RS transmission” is indicated to the UE, the UE may notmap/transmit the NR-PUSCH to/on a subcarrier unused for DM-RStransmission.

(4) Power level applied to NR-PUSCH transmission method

In the present invention, a UE may attempt to transmit an NR-PUSCH on asubcarrier unused for DM-RS transmission irrespective of an NR-PUSCHtransmission method (e.g., single AP transmission, TxD, or SM). Or theUE may be configured to operate in the above manner by RRC signaling.

Herein, if the NR-PUSCH is transmitted on subcarriers available forDM-RS transmission, there may be a limit on transmission power and/or anMCS. This is because other UEs may potentially transmit DM-RSs on thesubcarriers.

For example, the UE may transmit the NR-PUSCH with power lower thanNR-PUSCH power by P_offset (preset or configured byhigher-layer/physical-layer signaling). If there is a lower bound on theNR-PUSCH transmission power, and the power value to which P_offset hasbeen applied is lower than the lower bound, the UE may drop the NR-PUSCHtransmission or transmit the NR-PUSCH with power corresponding to thelower bound in a corresponding symbol.

In another example, a default modulation order for a symbol availablefor DM-RS transmission may be set to 2 (binary phase shift keying(BPSK)) (or a specific I_mcs value) (by higher-layer/physical-layersignaling).

(5) Information indicating the position of the starting symbol of anNR-PUSCH implicitly indicates whether “the NR-PUSCH is transmitted on asubcarrier unused for DM-RS transmission”.

If the position of the starting symbol of the NR-PUSCH is signaled,NR-PUSCH transmission may be allowed on a subcarrier unused for DM-RStransmission from the position of a symbol configured with DM-RStransmission to the position of the starting symbol of the NR-PUSCH. Forexample, if the starting symbol of the NR-PUSCH is indicated as symbol#2, and DM-RS transmission is indicated only for subcarrierscorresponding to D1 and D2 in the frame structure illustrated in FIG. 9,the UE may attempt to transmit the NR-PUSCH on the other subcarrierscorresponding to D3 and D4.

The configuration described in section 3.3.3. may also be applied in thesame manner to the PTRS (without additional signaling). By additionalsignaling other than the DM-RS, it may be indicated separately whetherthe NR-PUSCH is to be mapped/transmitted to/on a subcarrier unused forPTRS transmission (by physical-layer or higher-layer signaling).

3.3.4. It is Configured Whether a Signal Such as a PTRS or a DM-RS isAdditionally Transmitted.

In consideration of high mobility, BS-UE frequency/satellite/timetracking, or phase noise of an oscillator, it may be necessary toadditionally transmit a signal such as a PTRS or a DM-RS to help withchannel estimation. As the signal is transmitted more times, channelestimation performance is improved, thereby increasing signalingoverhead and degrading the transmission performance of PUSCH data. Thatis, there is a tradeoff between the transmission performance of PUSCHdata and signaling overhead. In this context, it may be regulated thatwhether a corresponding signal is to be transmitted additionally (and/orinformation about the positions/density of resources to carry the signaland/or the sequence of the signal) is configurable by higher-layersignaling or L1 signaling.

However, it may also be regulated that when the UE attempts initialaccess on a specific subcarrier, whether the signal (i.e., the PTRSand/or the additional DM-RS) is transmitted (and/or information aboutthe positions/density of resources to carry the signal and/or thesequence of the signal) is also configurable for a message 3 PUSCH(i.e., a PUSCH scheduled by a UL grant in a random access response (RAR)transmitted in response to an RACH transmission) in an RACH procedure.This signal configuration may be indicated by a system information block(SIB) or an RAR message.

Or, the configuration of the corresponding signal (i.e., the PTRS and/orthe additional DM-RS) (e.g., information indicating transmission ornon-transmission and/or information about the positions/density ofresources to carry the signal and/or the sequence of the signal) may beindicated implicitly, not explicitly. For example, when transmitting themessage 3 PUSCH in a specific frequency band (e.g., above 6 GHz), the UEmay always transmit the PTRS (or the additional DM-RS). In anotherexample, in the case where a signal is transmitted by analog beamsweeping, when transmitting the message 3 PUSCH in a specific frequencyband (e.g., above 6 GHz), the UE may always transmit the PTRS (or theadditional DM-RS).

3.3.5. PTRS Transmission Method for Supporting MU-MIMO Between CyclicPrefix (CP)-OFDM UE and DFT Spread OFDM UE (DFT-s-OFDM UE)

To support MU-MIMO between a CP-OFDM UE and a DFT-s-OFDM UE (or betweenDFT-s-OFDM UEs), it may be configured that the PTRS is mapped to allsubcarriers in a specific symbol (like the DM-RS). Or, the UE maypuncture an NR-PUSCH in REs to which the PTRS is to be mapped afterperforming DFT on the NR-PUSCH, or performing DFT with the number of REsexcept for the REs to which the PTRS is to be mapped, at the expense ofthe PAPR of DFT-s-OFDM.

If multiplexing between the NR-PUSCH and the PTRS is supported at thefront end of DFT to maintain a low PAPR for the DFT-s-OFDM UE, it may beindicated dynamically by a UL grant whether the PTRS mapping isperformed before or after DFT.

Specifically, when MU-MIMO is scheduled between a CP-OFDM UE and aDFT-s-OFDM UE (or between DFT-s-OFDM UEs), the gNB may indicate post-DFTPTRS mapping, and when an NR-PUSCH is scheduled only for the DFT-s-OFDMUE, the gNB may indicate pre-DFT PTRS mapping.

Now, a description will be given of a method of transmitting a UL signalto a BS by a UE among the foregoing various signal transmission andreception methods.

Specifically, when a UE according to the present invention transmits aUL signal to a BS, the UE may transmit the UL signal by using adifferent beamforming (i.e., precoder cycling) method for eachpredetermined resource area carrying the UL signal.

To this end, the UE transmits the UL signal by applying a differentbeamforming scheme to each of resource areas divided according to apredetermined rule in one or more symbols of one slot including aplurality of symbols.

The UL signal may be a PUCCH or PUSCH. While the following descriptionis given in the context of the PUCCH by way of example, the same thingmay apply to the PUSCH as another exemplary UL signal.

Further, applying a different beamforming scheme to each of resourceareas divided according to the predetermined rule by the UE may meanthat the UE applies one or more of digital beamforming, analogbeamforming, and hybrid beamforming differently to the respectiveresource areas.

For example, the UL signal may be transmitted in a 1-symbol PUCCHstructure. Then, the UE may transmit the 1-symbol PUCCH by applying adifferent beamforming scheme to each of the resource areas dividedaccording to the predetermined rule.

For this purpose, the UE may receive information about the predeterminedrule from the BS. The information about the predetermined rule mayinclude one of information about the size of frequency resources towhich the same beamforming scheme is applied, and information about afrequency resource range to which the same beamforming scheme isapplied.

Further, the UE may transmit the 1-symbol PUCCH by distributedly mappingthe 1-symbol PUCCH in the frequency domain within one symbol. Herein,the UE may transmit the 1-symbol PUCCH by applying a differentbeamforming scheme to each set of contiguous frequency resources or eachset of contiguous resources of the same comb index in the one symbolcarrying the 1-symbol PUCCH.

In another example, the UL signal may be transmitted in a 2-symbol PUCCHstructure.

Then, the UE may transmit the 2-symbol PUCCH by applying a differentbeamforming scheme to each of symbols carrying the 2-symbol PUCCH.

In this case, the UE may transmit the 2-symbol PUCCH by applyingdifferent beamforming schemes to a symbol carrying an RS and a symbolwithout an RS among the symbols carrying the 2-symbol PUCCH.

Or, the UE may transmit the 2-symbol PUCCH by applying a differentbeamforming scheme to each frequency resource area of a predeterminedsize in two symbols carrying the 2-symbol PUCCH.

In another example, the UL signal may be transmitted in a PUCCHstructure exceeding 2 symbols. This PUCCH structure will be referred toas a long PUCCH.

In this case, the UE may transmit the long PUCCH by applying differentbeamforming schemes to a symbol carrying an RS and a symbol without anRS among symbols carrying the long PUCCH.

Or, when the UE transmits the long PUCCH by frequency hopping, the UEmay transmit the long PUCCH by applying a different beamforming schemeto each hop in more than two symbols carrying the long PUCCH.

Since examples of the above proposed methods may be included as one ofmethods of implementing the present invention, it is apparent that theexamples may be regarded as proposed methods. Further, the foregoingproposed methods may be implemented independently, or some of themethods may be implemented in combination (or merged). Further, it maybe regulated that information indicating whether the proposed methodsare applied (or information about the rules of the proposed methods) isindicated to a UE by a pre-defined signal (or a physical-layer orhigher-layer signal) by an eNB.

4. Device Configuration

FIG. 18 is a diagram illustrating configurations of a UE and a basestation capable of being implemented by the embodiments proposed in thepresent invention. The UE and the base station illustrated in FIG. 18operate to implement the embodiments of the foregoing signaltransmission and reception methods between a UE and a BS.

A UE 1 may act as a transmission end on a UL and as a reception end on aDL. A base station (eNB or new generation NodeB (gNB)) 100 may act as areception end on a UL and as a transmission end on a DL.

That is, each of the UE and the base station may include a Transmitter(Tx) 10 or 110 and a Receiver (Rx) 20 or 120, for controllingtransmission and reception of information, data, and/or messages, and anantenna 30 or 130 for transmitting and receiving information, data,and/or messages.

Each of the UE and the base station may further include a processor 40or 140 for implementing the afore-described embodiments of the presentdisclosure and a memory 50 or 150 for temporarily or permanently storingoperations of the processor 40 or 140.

The UE 1 having the above configuration may transmit a UL signal (e.g.,NR-PUCCH or NR-PUSCH) in the following manner

Specifically, the UE 1 may transmit the UL signal, through thetransmitter 10, by applying a different beamforming scheme to each ofresource areas divided according to a predetermined rule in one or moresymbols of one slot including a plurality of symbols.

Various rules may be available as the predetermined rule, which divide atime/frequency resource area carrying the UL signal into resource areasto which different beamforming schemes are applied.

The Tx and Rx of the UE and the base station may perform a packetmodulation/demodulation function for data transmission, a high-speedpacket channel coding function, OFDM packet scheduling, TDD packetscheduling, and/or channelization. Each of the UE and the base stationof FIG. 18 may further include a low-power Radio Frequency(RF)/Intermediate Frequency (IF) module.

Meanwhile, the UE may be any of a Personal Digital Assistant (PDA), acellular phone, a Personal Communication Service (PCS) phone, a GlobalSystem for Mobile (GSM) phone, a Wideband Code Division Multiple Access(WCDMA) phone, a Mobile Broadband System (MBS) phone, a hand-held PC, alaptop PC, a smart phone, a Multi Mode-Multi Band (MM-MB) terminal, etc.

The smart phone is a terminal taking the advantages of both a mobilephone and a PDA. It incorporates the functions of a PDA, that is,scheduling and data communications such as fax transmission andreception and Internet connection into a mobile phone. The MB-MMterminal refers to a terminal which has a multi-modem chip built thereinand which can operate in any of a mobile Internet system and othermobile communication systems (e.g. CDMA 2000, WCDMA, etc.).

Embodiments of the present disclosure may be achieved by various means,for example, hardware, firmware, software, or a combination thereof.

In a hardware configuration, the methods according to exemplaryembodiments of the present disclosure may be achieved by one or moreApplication Specific Integrated Circuits (ASICs), Digital SignalProcessors (DSPs), Digital Signal Processing Devices (DSPDs),Programmable Logic Devices (PLDs), Field Programmable Gate Arrays(FPGAs), processors, controllers, microcontrollers, microprocessors,etc.

In a firmware or software configuration, the methods according to theembodiments of the present disclosure may be implemented in the form ofa module, a procedure, a function, etc. performing the above-describedfunctions or operations. A software code may be stored in the memory 50or 150 and executed by the processor 40 or 140. The memory is located atthe interior or exterior of the processor and may transmit and receivedata to and from the processor via various known means.

Those skilled in the art will appreciate that the present disclosure maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent disclosure. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of thedisclosure should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein. It is obvious to those skilled in the art thatclaims that are not explicitly cited in each other in the appendedclaims may be presented in combination as an embodiment of the presentdisclosure or included as a new claim by a subsequent amendment afterthe application is filed.

INDUSTRIAL APPLICABILITY

The present disclosure is applicable to various wireless access systemsincluding a 3GPP system, and/or a 3GPP2 system. Besides these wirelessaccess systems, the embodiments of the present disclosure are applicableto all technical fields in which the wireless access systems find theirapplications. Moreover, the proposed method can also be applied tommWave communication using an ultra-high frequency band.

1. A method of transmitting an uplink signal by a user equipment (UE) ina wireless communication system, the method comprising: transmitting theuplink signal by applying a different beamforming scheme to each ofresource areas divided according to a predetermined rule in one or moresymbols of a slot including a plurality of symbols.
 2. The methodaccording to claim 1, wherein the uplink signal is a physical uplinkcontrol channel (PUCCH) or a physical uplink shared channel (PUSCH). 3.The method according to claim 1, wherein the application of a differentbeamforming scheme to each of resource areas divided according to thepredetermined rule comprises applying one or more of digitalbeamforming, analog beamforming, and hybrid beamforming differently toeach of the resources areas divided according to the predetermined rule.4. The method according to claim 1, wherein when the uplink signal istransmitted in one symbol, the uplink signal is transmitted by applyinga different beamforming scheme to each of the frequency areas dividedaccording to the predetermined rule in the one symbol.
 5. The methodaccording to claim 4, further comprising receiving information on thepredetermined rule from a base station.
 6. The method according to claim5, wherein the information on the predetermined rule includes one ofinformation about the size of frequency resources to which the samebeamforming scheme is applied, and information on a range of frequencyresources to which the same beamforming scheme is applied.
 7. The methodaccording to claim 4, wherein when the uplink signal is mappeddistributedly in the frequency domain within one symbol, thepredetermined rule indicates division of resource areas in which adifferent beamforming scheme is applied to each set of contiguousfrequency resources or each set of contiguous resources of the same combindex in the one symbol carrying the uplink signal.
 8. The methodaccording to claim 1, wherein when the uplink signal is transmitted intwo symbols, the predetermined rule indicates division of resource areasin which a different beamforming scheme is applied to each symbolcarrying the uplink signal.
 9. The method according to claim 1, whereinwhen the uplink signal is transmitted in two symbols, the predeterminedrule indicates division of resource areas in which a differentbeamforming scheme is applied to each frequency resource area of apredetermined size in the two symbols.
 10. The method according to claim1, wherein the two symbols include a symbol including a reference signal(RS) and a symbol without an RS.
 11. The method according to claim 1,wherein when the uplink signal is transmitted in more than two symbols,the predetermined rule indicates division of resources areas in which adifferent beamforming scheme is applied to each of a plurality of symbolgroups into which the symbols carrying the uplink signals are grouped,and wherein each symbol group includes at least one symbol including anRS.
 12. The method according to claim 1, wherein if the uplink signal istransmitted by frequency hopping in more than two symbols, thepredetermined rule indicates division of resource areas in which adifferent beamforming scheme is applied to each hop in the more than twosymbols.
 13. A user equipment (UE) for transmitting an uplink signal toa base station (BS) in a wireless communication system, the UEcomprising: a transmitter; a receiver; and a processor operativelyconnected to the transmitter and the receiver, wherein the processor isconfigured to transmit the uplink signal by applying a differentbeamforming scheme to each of resource areas divided according to apredetermined rule in one or more symbols of a slot including aplurality of symbols.